The Primary Mathematics U.S. Edition series of elementary math textbooks and workbooks is meant to be part of a system of learning in which adult supervision and independent practice go hand in hand. The main feature of this series is the use of the Concrete> Pictorial>Abstract approach. The students are provided with the necessary learning experiences beginning with the concrete and pictorial stages, followed by the abstract stage to enable them to learn mathematics meaningfully. This approach encourages active thinking process, communication of mathematical ideas and problem solving. This helps develop the foundation students will need for more advanced mathematics.
Practice exercises are designed to provide the students with further practice after they have done the relevant workbook exercises. Review exercises are provided for cumulative reviews of concepts and skills. All the practice exercises and review exercises are optional exercises.
The color patch 
is used to invite active participation from the students and to facilitate oral discussion. The students are advised not to write on the color patches.
Above extract from Preface of Primary Mathematics U.S. Edition (reproduced with the permission of the publishers).
The textbooks contain the learning tasks for students to do under adult supervision and interaction, along with practice and review problems. They are meant to be non-consumable and to be used along with the Primary Mathematics Workbooks.
Answers or answer keys for Primary Mathematics U.S. Edition textbooks and workbooks are found in the teacher's guides and home instructor's guides. Answer keys booklets are also available - one for Primary 1-3 and one for Primary 4-6.
Primary Mathematics U.S. Edition 2B
Units highlighted in red are in this U.S. Edition but not in the 3rd Edition of Primary Mathematics.
1. Addition and Subtraction
- Finding the Missing Number
- Methods for Mental Addition
- Methods for Mental Subtraction
2. Multiplication and Division
- Multiplying and Dividing by 4
- Multiplying and Dividing by 5
- Multiplying and Dividing by 10
REVIEW A
3. Money (U.S. currency)
- Dollars and Cents
- Adding Money
- Subtracting Money
4. Fractions
- Halves and Quarters
- Writing Fractions
REVIEW B
REVIEW C
5. Time
- Telling Time
- Time Intervals
6. Capacity
- Comparing Capacity
- Liters
- Gallons, Quarts, Pints and Cups
REVIEW E
7. Graphs
REVIEW F
REVIEW G
8. Geometry
- Flat and Curved Faces
- Making Shapes
REVIEW H
9. Area
REVIEW I
REVIEW J (extra review exercises on customary measurements)
Samples
Chapter 4: Fractions - Halves and Quarters
Chapter 5: Time - Telling Time
Chapter 6: Capacity - Comparing Capacity
Chapter 6: Capacity - Gallons, Pints and Cups
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